Physics – Condensed Matter – Superconductivity
Scientific paper
2006-06-22
Physical Review B 74 (2006) 172504 (4 pages)
Physics
Condensed Matter
Superconductivity
published version; removed direct comparison with experiment for the upper critical field, as required by the referees
Scientific paper
10.1103/PhysRevB.74.172504
We study the effects of Fermi-liquid interactions on quasi-two-dimensional d-wave superconductors in a magnetic field. The phase diagram of the superconducting state, including the periodic Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state in high magnetic fields, is discussed for different strengths of quasiparticle many-body interactions within Landau's theory of Fermi liquids. Decreasing the Fermi-liquid parameter $F_0^a$ causes the magnetic spin susceptibility to increase, which in turn leads to a reduction of the FFLO phase. It is shown that a negative $F_0^a$ results in a first-order phase transition from the normal to the uniform superconducting state in a finite temperature interval. Finally, we discuss the thermodynamic implications of a first-order phase transition for CeCoIn$_5$.
Graf Matthias. J.
Vorontsov Anton B.
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